Price is about right. If you take it before the fallout gets into the food chain, you'll have a cancer free thyroid gland... too bad about your liver, pancreas, bones, stomach, etc.
It could make some difference if you're right on the edge of making it or not. But it would be better to understand about contamination and how not get the radioactive material into your system in the first place. And KI doesn't do anything for you in terms of "prompt" radiation.
Read OldBaldGuy's excellent post about it ("More on Homeland Security... " , 02/25/03 12:07 PM). And if you have any further questions I'll try to help.
Dr. Ben Davis, Nuclear Physicist turned Computer Programmer <img src="images/graemlins/smile.gif" alt="" />